Large-thickness Z-direction easily-welded steel for nuclear power pressure-bearing equipment and preparation method of large-thickness Z-direction easily-welded steel

• Main Authors: HU HAIYANG, SUN DIANDONG, GAO TIANYU, YAN BINGYU, DUAN JIANGTAO, WANG SHUANG, WANG YONG, ZHANG HANNING
• Format: Patent
• Language: Chinese; English
• Published: 12.09.2023
• Subjects: ALLOYS; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; CHEMISTRY; COMBINED OPERATIONS; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MACHINE TOOLS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; OTHER WORKING OF METAL; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; UNIVERSAL MACHINE TOOLS

The invention provides large-thickness Z-direction easy-to-weld steel for nuclear power pressure-bearing equipment and a preparation method of the large-thickness Z-direction easy-to-weld steel. The steel comprises the following components in percentage by mass: 0.06-0.12% of C; 0.25 to 0.40 percent of Si; mn: 1.15 to 1.55%; less than or equal to 0.015% of P; s < = 0.005%; 0.40 to 0.65 percent of Ni; 0.25 to 0.45 percent of Mo; 0.04% to 0.06% of V; the content of Als is 0.020 to 0.050 percent; 0.015% to 0.035% of Nb; 0.015 to 0.025% of Ti; 0.004-0.018% of RE (rare earth), and the balance of Fe and inevitable impurities. The steel plate provided by the invention is a high-strength steel plate which is compact in structure, clean in steel quality and uniform in performance, and is steel which is large in thickness and easy to weld and is used for nuclear power pressure-bearing equipment. 本发明提供一种大厚度Z向易焊接核电承压设备用钢及其制备方法，所述钢的成分及其质量百分比为：C：0.06～0.12％；Si：0.25～0.40％；Mn：1.15～1.55％；P≤0.015％；S≤0.005％；Ni：0.40～0.65％；Mo：0.25